The agates coming from Sweet
Home, Oregon appear to
be popular in the past for their cabochons that they were often sold by
gram. The agates are generally gray to purple sometimes with lighter
colored bandings.
I couldn't understand why are they called "Holly Blue", why not "Holly
Purple"? Those coming from pre-1980s digs tend to be more bluish
while those found later are more purplish. Both of two known
agate-producing
sites apparently exhausted while the cheaper and similar purple agates
coming from Mexico and Indonesia hamper any motivations to mine the
Holly Blue agates.

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Rough Appearance: Irregular Geometric shapes with purplish to gray
agate showing.
Agates are gray to deep purple, often with banding. (Pre-1980s agates
are more bluish)